深海游弋的鱼 – 默默的点滴

1.首先是创建一个广播接受者

private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {
		String SYSTEM_REASON = "reason";
		String SYSTEM_HOME_KEY = "homekey";
		String SYSTEM_HOME_KEY_LONG = "recentapps";
		 
		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
				String reason = intent.getStringExtra(SYSTEM_REASON);
				if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {
					 //表示按了home键,程序到了后台
					Toast.makeText(getApplicationContext(), "home", Toast.LENGTH_LONG).show();
				}else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){
					//表示长按home键,显示最近使用的程序列表
				}
			} 
		}
	};

private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {

String SYSTEM_REASON = "reason";

String SYSTEM_HOME_KEY = "homekey";

String SYSTEM_HOME_KEY_LONG = "recentapps";

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {

String reason = intent.getStringExtra(SYSTEM_REASON);

if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {

//表示按了home键,程序到了后台

Toast.makeText(getApplicationContext(), "home", Toast.LENGTH_LONG).show();

}else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){

//表示长按home键,显示最近使用的程序列表

}

};

2.注册监听

可以在Activity里注册，也可以在Service,Application里面

//注册广播
registerReceiver(mHomeKeyEventReceiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));

1 2	//注册广播 registerReceiver(mHomeKeyEventReceiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));

完整的代码如下：

import android.app.Application;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.TextUtils;
import android.widget.Toast;

public class MainApplication extends Application {

    /**
     * 监听是否点击了home键将客户端推到后台
     */
    private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {
        String SYSTEM_REASON = "reason";
        String SYSTEM_HOME_KEY = "homekey";
        String SYSTEM_HOME_KEY_LONG = "recentapps";

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
                String reason = intent.getStringExtra(SYSTEM_REASON);
                if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {
                    //表示按了home键,程序到了后台
                    Toast.makeText(getApplicationContext(), "home", Toast.LENGTH_LONG).show();
                }else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){
                    //表示长按home键,显示最近使用的程序列表
                }
            }
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
        //注册广播
        registerReceiver(mHomeKeyEventReceiver, new IntentFilter(
                Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
    }

    @Override
    public void onTerminate() {
        unregisterReceiver(mHomeKeyEventReceiver);
        super.onTerminate();
    }
}

import android.app.Application;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.text.TextUtils;

import android.widget.Toast;

public class MainApplication extends Application {

/**

* 监听是否点击了home键将客户端推到后台

private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {

String SYSTEM_REASON = "reason";

String SYSTEM_HOME_KEY = "homekey";

String SYSTEM_HOME_KEY_LONG = "recentapps";

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {

String reason = intent.getStringExtra(SYSTEM_REASON);

if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {

//表示按了home键,程序到了后台

Toast.makeText(getApplicationContext(), "home", Toast.LENGTH_LONG).show();

}else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){

//表示长按home键,显示最近使用的程序列表

}

};

@Override

public void onCreate() {

super.onCreate();

//注册广播

registerReceiver(mHomeKeyEventReceiver, new IntentFilter(

Intent.ACTION_CLOSE_SYSTEM_DIALOGS));

}

@Override

public void onTerminate() {

unregisterReceiver(mHomeKeyEventReceiver);

super.onTerminate();

}

参考链接：监听android home键的实现方式

Threading rules

There are a few threading rules that must be followed for this class to work properly:

The AsyncTask class must be loaded on the UI thread. This is done automatically as of JELLY_BEAN.

The task instance must be created on the UI thread.

execute(Params...) must be invoked on the UI thread.

Do not call onPreExecute(), onPostExecute(Result), doInBackground(Params...), onProgressUpdate(Progress...) manually.

The task can be executed only once (an exception will be thrown if a second execution is attempted.)

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日期: 2016 年 1 月 5 日

监听android home键的实现方式

java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)

Threading rules

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